CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 204

• Manufacturer Part Number: CN8237EBGB
• Description: ATM SAR 622Mbps 3.3V ABR/CBR/GFR/UBR/VBR 456-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of CN8237EBGB

• Package: 456BGA
• Traffic Class: ABR|CBR|GFR|UBR|VBR
• Utopia Type: Level 1|Level 2
• Host Interface: PCI
• Maximum Data Rate: 622 Mbps
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3.135 V

6.0 Traffic Management
6.5 Traffic Management Control and Status Structures
6.5.4 GFR-Specific Structures
6-48
Table 6-16. SCH_STATE for SCH_MODE = GFR
Table 6-17. SCH_STATE Field Descriptions for SCH_MODE = GFR
Word 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
MCRLIM_IDX
L1_EXP
L1_MAN
I1_EXP
I1_MAN
6.5.4.1 GFR Schedule
7
8
9
Field Name
MCRLIM_IDX
MCRLIM_IDX
Reserved
(MSB)
(LSB)
State Table
Index into table of 256 MCR LIMIT values each specifying an increase in the VCC’s priority by one if the
VCC’s rate falls below MCR. The table base is located on top of the BUCKET2 table whose base is given
by SEG_BCKB register field. The BUCKET2 table is 1 KB in length. Table values are in the form of a non-0
bit, exponent, and mantissa such that MCR_LIMIT is:
GCRA L parameter exponent for MCR bucket.
L1_EXP must satisfy
LI_EXP that does not satisfy
GCRA L parameter mantissa for MCR bucket
Bucket 1 L value is 2
GCRA I parameter exponent for MCR bucket.
I1_EXP must satisfy 10 I2_EXP
GCRA I parameter mantissa for MCR bucket.
Bucket 1 I value is 2
L1_EXP
MCR_LIM_NZ × 2
Tables 6-16
(I1_EXP – 10)
L1_EXP min I1_EXP
Mindspeed Technologies
(L1_EXP – 10)
Reserved
and
(MCR_LIM_EXP–10)
6-17
L1_EXP I1_EXP 9
L1_MAN
(1 + I1_MAN / 512)
(1 + L1_MAN / 512)
detail the SCH_STATE structure for GFR traffic.
25
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
(1 + MCR_LIM_MAN / 512)
+
Description
9 or 29
Reserved
–
will have effective L1 value of 0.
.
Reserved
™
I1_EXP
28237-DSH-001-C
Reserved
I1_MAN
CN8237